baber/WOPTO huggingface dataset:
Patent GB-533784-A (GB)
Title: Improvements in or relating to back coupled electron discharge tube amplifiers
IPC: H03G5/08
Filed: 1939-08-18
Abstract: 533,784. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and KEALL, O. E. Aug. 18, 1939, No. 23825. [Class 40. (v)] An amplifier comprising two valves in cascade, and with a negative feed-back impedance in one or both of their cathode leads, is given a desired amplitude-frequency or phase-frequency characteristic by interposing a frequency discriminating impedance or network between the cathodes for applying positive feed-back. As shown in Fig. 3a, a resistance R, R<SP>1</SP> is connected in each lead to the cathodes K, K<SP>1</SP> which are connected by a resistance K<SP>11</SP> in series with a condenser C. High-frequency response is in this case accentuated when the circuit is used in a telephone or television amplifier. Tone control may be effected by varying manually or automatically either the resistance R<SP>11</SP> or the capacity C. If the latter is of the potential-variable type an A.V.C. voltage my be used to give high-quality radio reception on strong local stations. The condenser C may be replaced by an inductance coil, one or more parallel-resonant circuits, or one or more series-resonant circuits, giving in all cases an accentuated response at the frequencies at which the impedance is low, and a diminished response for frequencies at which impedance is high. These circuits may be applied (1) as a heterodyne whistle eliminator, (2) as an image signal attentuator or an adjacent channel attentuator in superheterodyne receivers, (3) for homodyne or reinforced carrier reception (4) as a single frequency selective amplifier, or for selecting any one of several frequencies by providing several series-resonant circuits and a selector switch. In Fig. 6, a band-pass effect is obtained by connecting a four-terminal band-pass filter F between the cathodes. A piezo-electric crystal P, Fig. 5, may be connected between the cathodes of the valves V, V<SP>1</SP> for rendering the amplifier sharply selective to the crystal frequency. Each valve has a tuned anode circuit. and a resistance R<SP>111</SP> across the second circuit TC<SP>1</SP> is tapped and connected through a condenser C to the cathode of the first valve, with the object of balancing out the effect of the capacity of the crystal electrodes and holder. For wide-band telephonic reception the crystal may be switched out. In a further modification, Fig. 2, the cathodes K, K<SP>1</SP> are connected by two impedances Z, Z<SP>1</SP> in series -and their junction is connected to earth through an impedance Z". By increasing the positive feedback the circuits may be rendered self-oscillatory. Specification 467,430 is referred to.
Patent GB-272733-A (GB)
Title: A new or improved process of producing metal compounds
IPC: C01F11/22
Filed: 1926-06-07
Abstract: 272,733. Meyerhofer, A. F. June 7, 1926. Addition to 253,150. Hydrofluosilicic and phosphoric acids.-In the process of the parent Specification wherein barium silicofluoride is decomposed into barium fluoride and silicon fluoride, the barium fluoride being reacted with a salt or oxide to obtain a barium salt or oxide and an insoluble fluoride and the insoluble fluoride and silicon fluoride being treated with a strong acid to produce hydrofluosilicic acid, the hydrofluosilicic acid, instead of being used directly to regenerate barium silicofluoride, is used to produce another silicofluoride such as lead, copper, or potassium silicofluoride, which is then reacted with a barium salt to regenerate the barium silicofluoride.
Patent GB-909853-A (GB)
Title: Improvements in or relating to sound reproducing machines
Inventor: CHURCHILL JOHN ADRIAN
IPC: G11B17/16
Filed: 1958-07-25
Abstract: 909,853. Centre - post record changers. FOSTER-MALLARD Ltd. Oct. 26, 1959 [July 25, 1958], No. 24015/58. Class 40(2). In a rotating centre-post mechanism allowing the playing of both sides of a stack of records as generally described in Specification 909,852, a sizing plate 26 pivoted at 27 and with steps 28 corresponding to mixed record sizes limits the swing of a member 35 connected to the pick-up arm 19. During the auto-changing cycle, mechanism 20, detailed in the above Specification, causes a link 42a to urge a feeler 21 against the edge of the lowermost stacked record 13 on the upper turntable, a member 24, swinging with the feeler 21 and having a cam edge 25 limiting the swing of the sizing plate 26, under the influence of the cam and pin 40, 41, resilient means 39a, 42b allowing for over-swing of the levers 37, 39. The pin 27 is made movable to zero the starting positions of the styli accurately. As applied to a normal auto-changer, playing the upper sides only of a stack of records on a turntable, the feeler 21 is arranged to sense the diameter of the top record after dropping to the turntable.
Patent GB-817853-A (GB)
Title: Improvements in compressed air vehicle braking systems
IPC: B60T13/40
Filed: 1957-08-01
Abstract: 817,853. Air pressure braking systems. LANCIA & C. FABBRICA AUTOMOBILI TORINS S.p.a. Aug. 1, 1957 [Sept. 19, 1956], No. 24372/58. Class 103 (1). A compressed-air braking system for motor vehicles comprises two pneumatically independent air compressors 2, 22 supplying two pneumatically independent reservoirs 7, 27 and independent braking circuits for front and rear wheel brakes, each circuit including a control valve 8, 28 controlling the supply of air to the front or rear wheel brake cylinders 10, 30, respectively, the valves 8, 28 being concurrently operated by the vehicle brake pedal P, B. Safety valves 5, 25, pressure regulator sets 4, 24 and non-return valves 6, 26 are included in the conduits 3, 23 between compressors 2, 22, which may be a two-cylinder compressor or two single cylinder compressors, and valves 8, 28, which are connected to a service reservoir S via a three-way cock R and non-return valve V; the valve, V comprises a member 50 connected to a piston 51 slidable in a cylinder against a spring 52, the surface areas of members 50, 51 and spring 52 being such that air flows to reservoir S when the pressure in the remaining circuit is above a predetermined value, the reservoir S being normally fed from the compressor 2 via cock R since the rear brakes normally require a greater pressure than the front brakes. A delay valve 11 in the front wheel circuit ensures rear wheel braking before front wheel braking, the valve 11 comprising a disc 11a urged by spring 11b against a seat 11c and a disc 11d urged against a central bore in disc 11a by spring 11e, spring 11b being overcome to supply air from valve 8 to cylinder 10 and spring 11e which is weaker than spring 11b allows discharge of air from cylinder 10 on brake release; a calibrated bore is formed in disc 11d to equalize pressure on both valve sides on closure of disc 11a. On damage to any component 2-5 or 22-25 valve 6 or 26 closes and on pressure decrease in the corresponding reservoir a signalling lamp indicates the drop, the other circuit remains effective and the cock R rotated to connect reservoir S to the unaffected circuit. Damage between regulators 4 or 24 and valves 8 or 28 results in the corresponding braking circuit failure but the other circuit remains effective, the valve V preventing reservoir S from emptying and the cock R being rotated for connection to the non- affected circuit. The cock R can be rotated to disconnect reservoir S from either circuit should damage occur in the service circuit. In an embodiment, Fig. 4 (not shown), a joint couples the circuits on a tractor with braking circuits on a trailer vehicle, a valve similar to valve 11 being included in the tractor rear wheel circuit to ensure the trailer brakes are applied first, then the tractor rear brakes and then the front brakes. The service reservoir is normally fed from the rear brake compressor and the trailer reservoir from the front brake compressor.
Patent GB-263545-A (GB)
Title: Improvements in and relating to internal combustion engines
IPC: F01M1/02
Filed: 1925-10-01
Abstract: 263,545. Olarenshaw, G. T. Oct. 1, 1925. Force-feed lubricating.-In a double-acting internal-combustion engine, in which the piston rod 3 extends from both sides of the piston 2 through glands 4 in the cylinder heads 5, the outer end of the rod reciprocates in a chamber 9, which is closed at its outer end and is in communication with an oil supply pipe 11 through a port a its inner end, the end of the. rod in its outward movement cutting off the supply of oil, the oil trapped in the chamber being forced through a non-return valve 12<a> into a conduit 12 extending axially through the rod from end to end thereof. Oil passes through holes 14 in the rod into a hollow space or channels 13 in the piston 2, whence it passes to the periphery of the piston through radial holes 15. From the inner end of the conduit 12 oil passes to the cross-head and crank pin. Oil is supplied to the pipe 11 from the crank-case by a pump, and the pipe may deliver into a chamber 10 adjacent the chamber 9. Pipes 17, 18 lead from the chamber 10 to the glands' 4. The rod 3 may extend through two or more cylinders. In the Provisional Specification, it is stated that the pump chamber 9 may be provided with a relief valve, a valve arrangement for regulating the supply into the conduit 12 is described, and it is stated that oil may be forced into the conduit 12 through one of the glands and a radial hole in the rod.
Patent GB-204726-A (GB)
Title: Improvements in starters for electric motors
IPC: H01H29/22
Filed: 1923-10-02
Abstract: 204,726. Bayerische - Elektrizitats- Industrie Rott & Co. Oct. 2, 1922, [Convention date]. Mercury and other conducting-liquid switches. -Relates to motor starters of the type comprising a tiltable vessel containing a conducting liquid such as mercury. The invention consists in a tiltable apparatus comprising two mercury containers 106, 100, Fig. 1. When the apparatus is displaced from a horizontal position to the vertical position shown, mercury in the upper container 106 immediately flows over three contacts 103, 104, 105, whereby a motor field 122, Fig. 3, is excited from supply mains 118, 119. The mercury in the lower container 100 makes its way slowly through a tube 22 into a conical jacket 12 surrounding a block of resistance material 2, whereby current is gradually turned on to the motor armature 123. By combining three resistance bodies and three slowly emptying containers in one movable structure, the apparatus may be adapted for starting threephase motors.
Patent GB-532360-A (GB)
Title: Improvements in the manufacture of sheets or bands from highly viscous cellulose solutions
IPC: C08L1/00
Filed: 1939-08-26
Abstract: 532,360. Films &c. KALLE & CO., AKT.-GES. Aug. 26, 1939, No. 24597. Convention date, Aug. 29, 1938. [Class 2 (ii)] A highly viscous pasty solution of cellulose e.g. a solution in zinc chloride, sulphuric acid, or phosphoric acid, is extruded through a slot so as to form a foil or band, and to facilitate the extrusion the solution is heated superficially while it passes through the extrusion slot. Preferably the cellulosic solution is supplied to the'extrusion device at a low temperature e.g. 10‹C. The lips of the extrusion device may be heated to a temperature of 30‹-150‹C. or, in the case of high speed extrusion, they may be at 200-300‹C. In an example, a solution of cellulose in sulphuric acid of 60.3-65 per cent strength at 0‹-10‹C. and containing 7-8 per cent of cellulose is extruded under pressure through the slot of an extrusion device, the lips of which are heated by warm water to a temperature of 35‹-40‹C. The rate of extrusion is such that the film-forming mass is only superficially heated. The mass issues into a coagulating bath containing dilute sulphuric acid or strong ammonium sulphate solution at a temperature below 10‹C. A smooth surface film of good tensile strength is obtained.
Patent GB-803860-A (GB)
Title: Improvements in or relating to gas turbine engines
Inventor: LOMBARD ADRIAN ALBERT
IPC: F23R3/60
Filed: 1954-08-24
Abstract: 803,860. Gas turbines; axial flow compressors. ROLLS-ROYCE, Ltd. Aug. 24, 1955 [Aug. 24, 1954], No. 24658/54. Drawings to Specification. Classes 110 (1) and 110 (3). In a gas-turbine engine having an axial-flow compressor, the axial thrust on the compressor rotor towards the inlet is reduced in order to lower the thrust load on the shaft bearings. The combustion chamber is enclosed in concentric inner and outer annular air casing walls surrounding the shaft. The outer wall consists of the outer frame of the engine. The inner wall is supported, from the outer frame, at the down stream end, by radial struts and is free to slide axially, at the forward end. The interior of the member forming the inner wall is open to atmosphere and the downstream surface of the last-stage rotor-disc of compressor is thereby subjected to atmospheric pressure to reduce the forward axial thrust.
Patent GB-361352-A (GB)
Title: Manufacture of anti-halation dyestuffs and the application thereof
IPC: C09B57/00
Filed: 1930-08-18
Abstract: Furfural derivatives.--Compounds for use as antihalation dyes are obtained by combining 1 mol. of furfural with 2 mols. of a p-amino-hydroxybenzene or an O-alkyl derivative or nuclear substitution product thereof, the intermediate product formed from equimolecular parts being isolated or not.  According to examples, furfural is condensed with 1 mol. of 1-hydroxy-4-aminobenzene or with 2-chloro-hydroxy-4-aminobenzene, or with 1-methoxy-4-aminobenzene, and the products are condensed with 2-chloro-4-hydroxy-1-aminobenzene, 2 : 6 dichloro-1-amino-4-hydroxybenzene, and 1-amino-4-hydroxybenzene, respectively An example of the use of the products in coating a photographic plate or film is also given.
Patent GB-725107-A (GB)
Title: Improvements in and relating to stereoscopic motion pictures
Inventor: BOWEN ARTHUR
IPC: G03B35/20
Filed: 1953-09-07
Abstract: 725,107. Stereoscopic kiriematography. BRITISH THOMSON-HOUSTON CO., Ltd., Sept. 7, 1953, No. 24698/53. Drawings to Specification. Class 97 (1). Left- and right-eye views are projected from spaced synchronized projectors, each for the whole time that the film is stationary, the blackout period for the shift of each film falling symmetrically within the projection period of the other. Preferably the shift and projection periods are in the ratio of 1: 3. Projection and viewing filters are used.
Patent GB-532374-A (GB)
Title: Improvements in and relating to electric metering systems
IPC: H05G1/26
Filed: 1939-08-28
Abstract: 532,374. Current measurements. BRITISH THOMSON-HOUSTON CO., Ltd. Aug. 28, 1939, No. 24710. Convention date, Aug. 27, 1938. [Class 37] In measuring alternating current the error caused by the capacitance charging current is eliminated by passing through the indicating instrument a current equal and opposite to the charging component. Apparatus is shown for measuring the current in an X-ray tube 11. Current is supplied to the anode 15 from an auto-transformer 17 through a step-up transformer 49 having a primary winding 47 and two secondary windings 51 of which one supplies the anode 15 through rectifying valves 57 and the other is connected to a current transformer 67 connected to a D.C. milliammeter 83 through a rectifier 70. In order to compensate for the charging current component due to the capacitance 91 between the high-voltage conductors and earth a condenser 93 is connected in series with the secondary winding 95 of a current transformer 97, the primary winding 99 of which is supplied from the auto-transformer 17. A current equal and opposite to the charging current component is thereby sent through the winding of the current transformer 67. A spark-gap 75 is connected across the rectifier 70 as a protection against excess voltage.
Patent GB-189275-A (GB)
Title: Improvements in bed sheets and bed sheeting
IPC: D03D1/00
Filed: 1921-09-17
Abstract: 189,275. Finlay & Co., Ltd., J., (Stecle, H.). Sept. 17, 1921. Sheets; strengthened fabrics with integrallywoven portions having crammed yarns.-The central portion of bed sheeting is reinforced by the use of additional warp threads extending from end to end of the whole web. The sheets are cut to size from the web.
Patent GB-260740-A (GB)
Title: Improvements in shock absorbers for vehicles
IPC: F16F7/04
Filed: 1925-10-05
Abstract: 260,740. Rogers, F. H., (Eclipse Machine Co.). Oct, 5, 1925. Vibration-dampers.-In apparatus for vehicles of the type in which friction surfaces are pressed together by a spring, the pressure of the spring is automatically removed when movement takes place in one direction so as to reduce or remove the frictional effect, and is automatically applied when movement takes place in the reverse direction. In the construction shown, an arm 12 connected to the axle operates a disc 13 which moves between a friction plate 1 fixed to the frame and a friction plate 8 having a limited movement, friction-facing strips 14, 15 being secured to the disc 13. A central stem 20 projecting from the base 1 carries a disked plate 26 which forms an abutment for a low pressure spring 24 and a high pressure spring 23. The spring 24 acts constantly on the movable friction plate 8. The spring 23 bears against a shoulder on the stem 20 during the upward movement of the axle, but during downward movement it forces the plate 8 into engagement. The plate 8 is screwed on to a shifter 5 which is prevented from rotating but is slidable longitudinally on the stem 20. During upward movement of the axle, the plate 8 is rotated by the friction member 15 and moves the shifter 5 towards the base 1, the pressure between the parts 8, 15 being reduced until slip occurs. During downward movement of the axle the plate 8 screws the shifter 5 away from the base 1 until it lifts the spring 23 off its shoulder on the stem 20. The plate 8 at the same time comes into contact with a flange 11 on the shifter 5 whereby its rotation Is checked and maximum braking effect is exerted on the disc 13 connected to the arm 12. In a modification the spring 23 is always in contact with the end of the shifter and the cover 27 is secured to the plate 8. In further modifications', the disc 13 is held between the friction plate 8 and an additional friction plate which is movable slightly towards and away from the plate 8 but rotates therewith. In other constructions, a shorter arm is employed and a reduced frictional effect obtained by decreasing the radius of the friction element separating the disc 13 and the base 1. The spring 23 may bear only on the shifter.
Patent GB-1260809-A (GB)
Title: Dual volume control circuit
IPC: H03G1/00
Filed: 1970-05-22
Abstract: 1,260,809. Gain control. WESTINGHOUSE ELECTRIC CORP. 22 May, 1970 [27 May, 1969], No. 24812/70. Headings H3Q -and H4R. A volume control system includes a first circuit with a master variable impedance element and a second circuit including a light responsive variable impedance element connected between a source of audio signals and an amplifier where the intensity of a light source is varied from a remote position to provide a volume control. The master variable impedance element is the variable resistor R2 forming part of the potential divider R1, R2 and will vary the signal applied to the control grid of pentode V1. The second circuit comprises a potential divider formed by resistor R3 and light sensitive resistor R4 which is housed together with lamp X1 in box 12. The intensity of illumination of the lamp is altered by means of resistor R8 to give a variation of resistance of R4 from 100 M# (dark) to less than 0À1 M# (light) thus altering the attenuation of the input circuit to a considerable extent regardless of the position of the master control slider M.
Patent GB-1255122-A (GB)
Title: Improvements in and relating to voltage regulators for a.c. generators
IPC: H02J7/14
Filed: 1970-05-22
Abstract: 1,255,122. Automatic voltage control. ROBERT BOSCH G.m.b.H. May 22, 1970 [May 23, 1969], No.24853/70. Heading G3R. The output voltage of a permanent magnet A. C. generator 11, having magnetically-coupled output windings 14, 15 supplying D. C. loads 22, 23 through rectifier diodes 16, 17, is maintained at a predetermined value by a regulator 26 comprising thyristors 32, 33 which are in parallel with respective windings 14, 15 and which are fired to short circuit these windings when the output voltage exceeds the predetermined value. When this occurs, a transistor 27 conducts to cause conduction of a transistor 28 which supplies a firing signal to thyristors 32, 33 through two equal, parallel-connected resistor branches 34, 36 and 35, 37 providing equal control currents. The thyristors 32, 33 fire in turn, each short circuiting its own winding and the other by virtue of the magnetic coupling. The coupling resistor 53 ensures rapid turn on and off of the transistors 27, 28. If the battery 22 should be removed during operation of the generator, a Zener diode 39 conducts when the voltage reaches a predetermined upper value and fires the thyristors 32, 33 to produce regulation at this upper value. Temperature compensation is provided by the diode 46.
Patent GB-637853-A (GB)
Title: Improvements in slide rules
IPC: G06G1/04
Filed: 1945-09-26
Abstract: 637,853. Calculating-apparatus. OBRECHT, R. E. Sept. 26, 1945, No. 24920. Convention date, April 27, 1944. [Class 106 (i)] A slide rule comprises two fixed strips and an intermediate slide arranged in a common plane wherein the strips are supported on a base member and are covered by a transparent panel, the longitudinal marginal edges of the base member and the panel being engaged by separate reinforcing members. As shown, the device comprises a pasteboard base 22, two bracing strips 23 secured to the base, a graduated slide 25 and a graduated cover 26 of transparent material. The longitudinal margins of the assembly are reinforced by slit tubes 27 clamping the edges. In a modification, Fig. 2, the edges of the base 22 and cover 26 are flanged and the bracing strips are held in position by means of a rubber strip 33. The rubber strip may be replaced by a spring. The base may also be transparent. In a further modification, two printed plates are inserted between the transparent base and cover members. The tubes may be provided with bevelled profiles.
Patent GB-443729-A (GB)
Title: Improvements relating to advertising projectors
IPC: G09F19/18
Filed: 1934-08-30
Abstract: 443,729. Changing signs. CINESCOPE PUBLICITY CO., Ltd., Prudential Buildings, Southampton, and HASSELKUS, J. W., 3, North Side, Clapham Common, London. Aug. 30, 1934, No. 25008. [Class 3 (i)] Optical-projection apparatus.-A transparency-carry - ing drum 8 is rotated intermittently to bring the transparencies in succession into the beam path of a projector by a continuously rotating shaft 17 driven by a rheostatcontrolled motor through gearing. The shaft 17 carries a longitudinally-adjustable radial arm 20 which engages at each revolution a pin 13 projecting rearward from the drum 8, one pin being provided for each transparency. Between each pair of pins 13 is a flared notch 14 in the drum rim, which notches are engaged by a locking lever 23 to hold the drum stationary during display. The lever 23 is rocked against the pull of a spring 24 to release the drum, just prior to its movement, by a cam 22 mounted on the shaft 17. The projector lamp is switched off during movement of the drum 8 by a cam 35 on the shaft 17, which bears against a spring- retracted lever 37 to tilt a mercury switch 36. The transparencies are detachably held in slideways, in which they are secured by leafspring clips, each of which covers two adjacent slideways.